AP BIOLOGY

Detailed explanation-1: -Figure 21: A cross between a red and white snapdragon will yield 100% pink offspring. This pattern of inheritance is described as incomplete dominance, meaning that neither of the alleles is completely dominant over the other: both alleles can be seen at the same time.

Detailed explanation-2: -In snapdragon i.e. Antirrhinum majus, the flower color is controlled by incomplete dominance. The snapdragon flower has two flower colours, red (RR) and white (rr). When cross-pollination occurs between red and white flowers, a pink (Rr) snapdragon flower is produced.

Detailed explanation-3: -Flower color in snapdragons is an example of incomplete dominance. When a red-flowered plant is crossed with a white-flowered plant, the offspring have pink flowers. If a pink-flowered plant is crossed with another pink-flowered plant, their offspring will be: 25% red, 50% pink, and 25% white.

Detailed explanation-4: -So, the correct option is ‘25%’.